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Recovery of bacteria from fecal pellets, the cecum, and the Peyer's patches of BALB/c mice following oral inoculation with an equal mixture of AH9 (ΔshdA::Kmr) and IR715 (wild type [wt]) (A), AH12 (ΔratB) and AJB715 (wt) (B), or RAK19 (sivH::Kmr) and IR715 (wt) (C). The ratio of the two strains present is given as the mean ± standard error. An asterisk indicates that the output ratio was significantly different (P < 0.05) from that present in the inoculum.
